Refrigerating apparatus



July 2, 1929. v J. G. KING' 1,719'117 K I "REFRIGEATING APPARATUS Filed Feb, 6, 1926 magg; ll ram-mm Lulunxumcfun,

Patented July 2, 1929.

UNITED STATES 1,719,111 PATENT OFFICE.

JESSE G. KING, OF DAYTON, OHIO, ASSIGNOR, BY MESNE ASSIGNMENTS, T FRIGID- AIRE CORPORATION, A CORPORATION 0F DELAWARE.

REFRIGERATING APPARATUS.

Application led February 6, 1926. Serial No. 86,590.

the accompanying (lia\\'i1igs, wherein a pefer-red form of embodiment of the present 1nvention is clearly shown.

, In the drawings:

Fig. 1 is a pla-n View of an ice cream cabinet showing inserted therein a cooling unit built according to this invention.

Fig. 2 is a side elevation of a cooling unit built according to this invention.

Fig. 3 isa front end elevation thereof.

AFig. 4 is a rear end elevation thereof.

Similar reference numerals refer to similar parts throughout the several views.

Numeral designatesl the cylindrical header tank which contains Within a suitable form of fioat valve (not shown) which maintains the liquid refrigerant Within `tank 10 at a substantially constant level. Liquid refrigerant is led to tank 10 through the duct 11. The vapor-ized refrigerant is led from said tank through the duct 12 which leads off from the space above the liquid level in tank 10.

A series of duct loops 15 are connected in parallel to tank 10 below theliquid level therein and depend therebelow int-o the medium cooled by the cooling unit. The connections 16 of these loops 15 are preferably staggered, as clearly shown in the drawings, in order that the loops may be placed close together longitudinally of the tank 10 and yet permit the connections to be suliiciently spaced to be properly ma'de. These loops 15'are made of seamless copper tubing and hencethey may be easily flattened in section (see Fig. 2) so that said loops will be Ispaced apart longitudinally of tank 10 to permit bettercirculation therethrough -of the liquid cooled thereby. Also the lattening of these tubes gives an increased heat transfer sur,- face per volume of liquid refrigerant therein. An extension header 20 of very .much smaller diameter than tank 10 is rigidly connected to the rear end of the tank by Welding dr by anyother suitable means. This eX- tension 20 is also provided with a series of depending' loops 21. 1n the drawings, these loops .21 are shown soniewhat shorter than the loops 15 and spaced further apart, however, if desired, loops 21 may he shaped and spaced similarly to loops 15. The extension header 20may be made any desiredlength in order to get the desired amount of cooling surface on the cooling unit. It is thus seen that the .tloat tank 10 an be made only large enough to conveniently accommodate the float valve mechanism while the extension 20 per mits the coolingl surface ofthe entire unit to be made as large as desired. Economy in manufacture is thus obtained, especially since a single size of fioat tank l0 may be used standard on various sizes of cooling units. 'lhe smallest size unit, of course, would be that whenextension 2() is omitted entirely.

Fig. 1 illustrates the cooling unit described above immersed in the brine tank 3() of an ice cream cabinet. The ice cream cabinet herein shown is substantially the same as that shown in my copending application Serial No. 702,456, filed l'tlarch 27, 19211. The brine circulates around and is cooled by cold surface of the cooling unit and thus maintains the eight large ice cream containers oi compartments 31 at the desired cold temperature.

It is obv'ious from the disclosure that the tank 10 and duct loops 15 provide a larger heat exchanging area than the header 2O and loops 21. And, it is apparent that by virture of this construction, that the cooling medium within the tank and adjacentthe tank 10 and loops l5 will be maintained at a lower temperature than the brine adjacent header 2O and loops 15. In this manner the ice cream,for example, will be maintained colder in certain of said compartment 31 than in others. This. feature of the invention has certain advantages in that it is desirable to maintaincertain ice cream colder than others,

vfor example, it is desirable to maintain brick ice cream colder than ice cream which is dipped from the eompar. ment. By placing the brick icecream in t e square compartments 81, lying adjacent the tank 10 and loops 15, it Will beA maintained colder than. the ice cream in other compartments.

The compartment 32 is adapted to'containthe compressor mechanism which supplies the liquid refrigerant to the cooling unit through duct 11 and receives the refrigerant vapor therefrom through the duct l2. The

. construction ofi this compressor mechanism forms no part of the present invention and hence is not shown or described herein.

It will be clear from viewing Fig. 1 that for ice cream cabinets having only one row of ice cream containers 31 the extension header 20.would be dispensed with, since in that case the cabinet would be only about half as wide as the double row cabinet shown.

While the form o f embodiment of the present invention as herein disclosed, constitutes a preferred form, it is to be understood that other forms might be adopted, all coming within the scope of the claims which follow.

Vhat is claimed is as follows:

'1. A cooling unit for mechanical refrigerators comprising: a tank adapted to contain liquid refrigerant. ata constant level therein, I

- outlet ducts connected thereto, a series of duct loops connected to said tank, an extension header of smaller cross-section than said tank. and connected to an end wall thereof, and a second series of duct loops connected to said header.

3. A cooling unit for mechanical refrigerators comprising: a liquid refrigerant tank having mechanism therein for maintaining a' constant liquid level, refrigerant inlet and outlet ducts connected thereto, a series of duct loops connected to saidtank, a. header pipe rigidly connected to an end wall of said tank below the liquid level therein, and asecond series of duct loops connected to said header plpe.

4. A cooling unit for mechanical refrigerators comprising: a tank adapted to contain liquid refrigerant, an extension header connected to an end wall of said tank below thc liquid level therein and adapted to receive refrigerant therefrom, said header extending longitudinally beyond said tank, and a series of duct loops connected with said header.

5. A refrigerator comprising a plurality of compartments, means for cooling said compartments to different temperatures respectively including a cooling unit disposed adjacent'said compartments, said cooling unit including tank means adapted to contain a constant quantity of liquid refrigerant', the

vportion of the unit adjacent one of said compartments lhaving a greaterheat exchange area than the portion of the unit lying adjacent another compartment.

6. A refrigerator comprising a cabinet, a tank within said cabinet adapted t0 contain a cooling medium, a pluralit of com artments extending into said lcoo ing me ium and means for cooling said compartments to different temperatures res ectlvely including a cooling unit disposed a jacent said compartments, the portion-of `the'unit adjacent one of saidl compartments having a greater heat exchange area than the portion of the unit lying adjacent another compartment.

7. A refrigerator comprising a cabinet, a 'tank within said cabinet adapted to contain a cooling medium, a plurality of pairs of food compartments extending into said cooling medium and means for cooling certain pairs of said compartments to different tem'pera. V tures res compartments, the portion of the unit adjacent certain pairs having a greater heat exchanging area than portion adjacent other pairs.

In testimony whereof I heretov aix my signature.

` JESSE- G. KING.

ctively including a cooling unit ex. tending etween a plurality of pairs of said 

